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Geological Survey of Japan Radiocarbon Dates I

Published online by Cambridge University Press:  18 July 2016

Shigeko Togashi  and
Eiji Matsumoto
Shigeko Togashi
Affiliation:
Geological Survey of Japan, Tsukuba, Ibaraki 305, Japan
Eiji Matsumoto
Affiliation:
Geological Survey of Japan, Tsukuba, Ibaraki 305, Japan
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This radiocarbon laboratory began operation in 1980 using the benzene scintillation method. The benzene synthesizer is essentially identical with that of Ikeda (1976). A liquid scintillation counter is Aloca LSC-LB1. Samples dated are wood, charcoal, shell, and coral.

Pretreatment of wood and charcoal is a standard acid-alkali procedure, using 2% HCl and 2% NaOH at elevated temperatures. Charcoal is further heated in concentrated HNO3 for one hour, diluted in water, stands one night, and is washed and dried. Pretreated wood and charcoal are carbonized before combustion. The combustion products are passed over CuO, and are collected in an ammonium hydroxide bubbler system, and precipitated with calcium chloride.

Type
Date Lists
Information
Radiocarbon , Volume 26 , Issue 2 , 1984 , pp. 206 - 211
Copyright
Copyright © The American Journal of Science

References

Ikeda, S, 1976, Measurement of weak radiocarbon by benzene liquid scintillation method: Isotope News, v 336, p 6–7.Google Scholar
Kim, S M, Ikeda, S, and Ruch, R R, 1969, Labeling of benzene with carbon and hydrogen isotopes: Radiochem Radioanal Letters, v 1, p 379–382.Google Scholar
Noakes, J E, Kim, S M, and Stipp, J J, 1965, Chemical and counting advances in liquid scintillation age counting, in Chatters, R M and Olson, E A, eds, Internatl conf on radiocarbon and tritium dating, 6th Proc: Washington, DC; Clearinghouse for fed sci and tech inf, Natl Bur Standards, p 68–92.Google Scholar
Valastro, S Jr, Land, L S, and Varela, A G, 1977, An improved procedure for wet oxidation of the 14C NBS oxalic acid standard: Radiocarbon, v 19, p 375–382.Google Scholar